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        </div><article class="page single"><h1 class="single-title animated flipInX">关于清华大学评选的首批标杆课程</h1><div class="post-meta">
            <div class="post-meta-line"><span class="post-author"><a href="/" title="Author" rel=" author" class="author"><i class="fas fa-user-circle fa-fw"></i>辛载阳</a></span>&nbsp;<span class="post-category">收录于 <a href="/categories/%E5%A4%A7%E5%AD%A6/"><i class="far fa-folder fa-fw"></i>大学</a></span></div>
            <div class="post-meta-line"><i class="far fa-calendar-alt fa-fw"></i>&nbsp;<time datetime="2019-02-25">2019-02-25</time>&nbsp;<i class="fas fa-pencil-alt fa-fw"></i>&nbsp;约 1533 字&nbsp;
                <i class="far fa-clock fa-fw"></i>&nbsp;预计阅读 4 分钟&nbsp;</div>
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            </div><div class="content" id="content"><p><a href="https://mp.weixin.qq.com/s/Nq96iYCoTN1Gj5Ca3X4Eow" target="_blank" rel="noopener noreffer">清华标杆课教师 | 物理系徐湛：用赤诚之心教给学生看家本领</a></p>
<p>先放张徐湛老师的量子力学结课合影（手动艾特当时认识的大佬 <a href="https://www.zhihu.com/people/49120fb60dd3fd2a98ffb7c075af7d32" target="_blank" rel="noopener noreffer">@刘书玮</a>）</p>
<p><img
        class="lazyload"
        src="/svg/loading.min.svg"
        data-src="https://pic3.zhimg.com/80/v2-af34b4b39ccbc4ad28fae07dd82dd96d_1440w.jpg"
        data-srcset="https://pic3.zhimg.com/80/v2-af34b4b39ccbc4ad28fae07dd82dd96d_1440w.jpg, https://pic3.zhimg.com/80/v2-af34b4b39ccbc4ad28fae07dd82dd96d_1440w.jpg 1.5x, https://pic3.zhimg.com/80/v2-af34b4b39ccbc4ad28fae07dd82dd96d_1440w.jpg 2x"
        data-sizes="auto"
        alt="https://pic3.zhimg.com/80/v2-af34b4b39ccbc4ad28fae07dd82dd96d_1440w.jpg"
        title="img" /></p>
<p>作为一个非物理系的选修徐湛老师的量子力学，可能我的体会和感受会和物理系的同学有所不同的</p>
<p>我记得当时是我先修了倪军的统计力学然后才去上的量子力学，不过在上统计力学的时候就看过了 David Tong 的 QM 的讲义，当时对于量子力学的认知还是仅限于费曼三（但是后来我才发现费曼三其实我完全没看懂……徐老师的费曼三讲的据说也非常好 不知道现在研究生的我有没有机会去旁听一下）。说的有点偏了，说回来，当时选了量子力学之后，被一众大佬推荐了 Shankar, Sakurai 和 Griffith，于是假期先看了一部分，但是看 Sakurai 完全看不懂。</p>
<p>但是上了徐老师的课，像是开启了量子力学的大门。</p>
<p><strong>徐老师严谨授课，学识</strong></p>
<p>**渊博。**徐老师上课有个特点，总是遵循最基本的原理和最简洁的表述，从他讲基本定理的时候就是如此，到后来讲到 CG系数、角动量的时候也是如此，能将其实相对比较复杂的概念讲的十分清楚，算是很有功力。我记得几乎每节课我们都有很多人找老师答疑，多是有所拓展，我还记得当时我请教了徐老师一个声子长程关联作用的问题，他认认真真给我讲了十分钟，还指出了我如果研究的话可以从哪些角度入手。实际上，这样的交流氛围，即使在我们崇尚交流和发散的钱班内部也是少见的。</p>
<p>其实我当时一度以为，老师为什么不多拓展一些，也不要那么地严谨，后来直到我试着读 Dirac 的时候才发现，当年的徐老师是在培养我们的物理范式和思维习惯。</p>
<p><strong>当然，除了对于物理学的严谨，徐老师也鼓励我们做大胆的假设</strong>，物理系有一句流传很久的名言：“好的物理学家做合理的近似，伟大的物理学家做不合理的近似。”（王亚愚），徐老师讲到散射理论和微扰计算的时候，都很注重让我们体会其假设的合理性和适用性。</p>
<p>其实最让我印象深刻的还是当时正值“凡伟”一事发酵，在一节课下，平时几乎不做课外评论的他给我们说出了这样的感受：</p>
<p><a href="https://zhuanlan.zhihu.com/p/26774146" target="_blank" rel="noopener noreffer">徐湛老师对于凡伟一事的一个评论</a></p>
<blockquote>
<p>“我只发表一个评论，就是各位同学在自己的学习和科研中，特别是如果以后要从事基础物理的研究，所应该明白的一个东西，这个法则你们早就听说过，但是我觉得你们可能不是真正明白它的确切含义”。
“实践是检验真理的唯一标准。我们都知道，物理学的理论必须要经过试验的验证才能被证实，这也是我们大多数人对这句‘实践是检验真理的唯一标准’的理解，但是这其实只是这句话的一半含义，甚至是不那么重要的一半。重要的一半是，物理学的理论，不仅仅需要满足已有的实验结果，更重要的是，要能够对于未来的现象和试验的结果做出预测，从而指导我们下一步的行动。就如同当年张守晟提出‘量子反常霍尔效应’，后来被薛其坤试验验证，杨先生评价这是‘中国实验室里的第一个诺贝尔奖级别的实验结果’，其实很重要的是，这是一次对于理论成功预测试验的验证。”
“我文革被下放到农场劳动，做了五年电工，我自己大学学习的是核物理专业，当时面对厚厚的一摞国家标准、工程规范，我的脑子里只有我学习过的麦克斯韦方程组，但是我知道，这些就是我必须要掌握的，而且要不打折扣的去执行的，而且多年的实践已经证明，基于电磁场等物理学理论所建立起的现代社会的各个行业、方方面面的规范和方法，很好地保障着和推动着这个社会的发展。你要说，你改写了教科书，那么就请你去电机机械厂，用你的理论指出我们原来的这样一套理论所建立的这些规范和方法，哪里不对，甚至是一点点的改动。”</p>
</blockquote>
<p>当时我在上面那篇分享的结尾这样写道：</p>
<p>“我觉得，这段话说来掷地有声，很有道理，并且也说出了为什么我自己对于物理学一直钟爱的原因，正如我在题图中的那句谢耳朵的名言所言，“I am a physicist and I have a working knowledge of the entire universe and everything it contains”</p>
<p><strong>能得这样的老师而受教，实在是莫大的幸事。</strong></p>
<hr>
<p>放个彩蛋</p>
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